Hello @Gael Richier !
Unfortunately having spaces within the ID
can lead to errors, we recommend only using alphanumeric characters and '-' or '_' for the ID
A workaround is effectively to remove the rule from /var/rudder/configuration-repository/rules
as you did, but you need to commit that on the git repository, AND also commit all other changes on rules. In practice :
git add ./rules
git commit -m "Delete 'Audit all host' rule, ..."
Then you would need to use to archiving feature of Rudder : in the menu, open Utilities > Archives, and scroll to Archive rules, then restore rules with Latest Git commit.
After that, the rule should have been deleted from Rudder.
Beware that if you don't correctly commit your changes on rules, you may lose data. So you should double check that !